A study of magnetic and electronic hyperfine interactions in epitaxial film of yttrium-iron garnet by the method of conversion electron Mössbauer spectroscopy
- Авторлар: Moklyak V.1
-
Мекемелер:
- Kurdyumov Institute for Metal Physics
- Шығарылым: Том 45, № 8-9 (2016)
- Беттер: 587-592
- Бөлім: Article
- URL: https://journals.rcsi.science/1063-7397/article/view/186088
- DOI: https://doi.org/10.1134/S1063739716080114
- ID: 186088
Дәйексөз келтіру
Аннотация
Magnetic and electric hyperfine interactions in the near-surface layers of epitaxial films of yttrium-iron garnet of the (111) orientation grown by the liquid-phase epitaxy method are studied by the method of the conversion electron Mössbauer spectroscopy (CEMS). The studies reveal a stoichiometric violation of the anion sublattice in the near-surface layers (≈8 × 10–8 m) of yttrium iron garnet film and, as a consequence, the formation of two types of d-sites, which is associated with a significant concentration of point defects in the anion sublattice of the near-surface area and the growing weight of the covalent bonding in the transition film–air layer. This also causes the presence of a fixed doublet component corresponding to iron ions in a paramagnetic state with an intermediate degree of valency between +2 and +3. It is shown that interpretation of the spectroscopic results using the Hamiltonian of mixed magnetic and quadrupole interactions makes it possible to obtain a vector diagram of the spatial orientations of the effective magnetic fields at the Fe57 nuclei and, as a consequence, to reconstruct the formation mechanism of the resulting vector of the magnetic moment of the yttrium iron garnet epitaxial film. Our studies reveal a slight noncollinearity of ≈4° in the orientations of the magnetic moments in the a- and d-sites of iron. The obtained results complement the picture of the magnetic and electronic hyperfine interactions in the epitaxial ferrite-garnet films and should be considered in the practical applications of the magnetic properties of such materials.
Авторлар туралы
V. Moklyak
Kurdyumov Institute for Metal Physics
Хат алмасуға жауапты Автор.
Email: mvvmcv@mail.ru
Украина, bul’v. Akademika Vernadskogo 36, Kyiv-142, 03680